Uniformly tensioned reversing motion for loom let-offs



Dec. 6, 1927. 1,651,566

w. H. WAKEFIELD UNIFORMLY TENSIONED REVERSING MOTION FOR LOOM LET-.OFFS

Filed Auez. 22. 1925 e i E loosely lilountell on libe arose slm'lt lll; und

` tliilt lillehlmd level' 2l may be having pivotefl libel'el'o es .at 20. :11 llzlml lever 2l which eopporleotml 18. i

Under iiorllizll eolilliluione 'l'lio level* lll is lielll Slzll'ionzli'y by e weighted lock pivolfed at :B-3 lo e braelret 2l secured to ihr-loom franje l() es silowll in" Figs. l :loll 5. Seid weighted look 529, llos u. llet'ent 25 which normally llllller` [Elle leverll to limit `flownwlllll luovellielil of ille loller While :l fixed elucl 2G eeeorel'l lo lll-e looiii 'freine engages llle ulllpei portion of lille lever l) lo limit npwalrll liloveliiellt tllei'eol".

Slli l"lererfl9 is `formed with upper and lower spliced orme "eml 28." respectively, between wllell extends alli adjusting screw i159 eetoelille bye luulfl wheel; 3). Said wheel secured to the sel-ew 29 above lille :will 27 :mtl a Collar Ble seoultefl lo Seid `selrfm' ou lille `siljleof saiclollli 2T, `this ConU l'llelion `permilling free rotelioliol' the screw :29 in ite `liellri11g; but preventing longil'lln rlimll movement' thereof.` A bleek `3? is threaded on the screw 29 end is provided with lllllelelit or ,Hotell 33 wlxiob iiorinolly receives the fol-werd eml of tbe bend lever 21. Rotation o'f hund wlleel 30 liloves Suid bloekgllp or down lo olljoet llie position oil? the hand lever 21 with l'espeetv to ille level' 19 ariel therefore lille `'lielioll between" lthe band 16 luid` `the dimm "15. i

Uoller normal conditions lorer 19 is `lielll etotioiml'y `by means `llrezlly leeelibeil oo lllovecl` with respect thereto. At the time of 1)Aiielflollt Said lever 2l will be 'Hexedol'l' `theIlloeli 33 il.; ellownin dotted lines in Fige. 4l 21ml `5 :incl lowered by the operator `to ll'ie position sllownin full lines ill Fig. il. Ae Sllill lilllirl level" is lowered it will eiillgoigel'lleillelillerl 'face l-l of the weighted lool;

ix u.

i lilove the Sallie .te the doljl'efl lille iloeilrioil .lll

Shown iii This releases (lle level' 'lll aulcl lille weaver een pl'eveiitl'lle smile from falling by i llolrlioef` lliiilfl wheel l parte are now illolierllo the lottell `lille position Shown lli 1 `ig'.2,lille relative ll'loveil'lelit o the lle-lill leverl 2l with lgeepeet lio the lever 19 `having sllleleilelltll bend lo :'-zo tllzli'y Said parte "muy move downwardly williolllf calming rotetioil of :the flljmn l5. llle operetol" will lllelrlloldfllle lever l!) ,ill lowelell. poe' -ioll` and `will relie@ lille lionel block 3Q. `The friction bowl lllos l'eolorell to its original leueion :lull ee the levers; lil :loll 2L are l'zlisol'l the flrlllllwill loe einen mi angular vlilovemenl. in

i level' v21 mi il the eamo ie leelzillg ou ll'ie repellted es, often es desired lmljl lille `fell of the elotll reached lille leefl wlllell is oo fronteelitel".

dflilli toiresitore the "semeftelleoli wlliell i i i i :l lil'eetioli to turollie drum l1 backward. `Thls operation muy be 522 ood" will 'lli e i i u Additional llloveiiieol: oflleere *1:9*n aofl eiffel-the `fell lille rellcllel the l reed `elzluses sllppllig" of the bellcl zllfoilllcltlle `(limited in plotted lines in Fig. 2.

lrolll llle `l'oreglfoingit "will be seenltlllltl llave provided moons for lllovingllle friction banal as :l whole about ll ille saine slaeliellell lo oeelullezl different angular position with reiqleet to smid flrum. Tile originel :tension only l'llieo be reetol'efl while l'lie operzilingi levers; :1re in lmvereil polsilljon `aller wliiell ellirl level-sorely be reieelllo transmit: nioliolrlo` lllewvarp lleu livery (ll'llm by :l friotiolflzll force wlliehis` ll'le emile ile lillois wllich:n.zislellmler` normal. weaving conditions. i C

llzlvillgplalllls described my invention ily will be -zlppzlrelltftllllt changes andi mocliiieatiene `may be illallflelllelein l'lylilloseekilledu ill tbe art without: llepllrting from `tl'leispirit :unl eeope oli libe invention, anclfI do not w'ioll lo be linlilocl lo tliefletllils llel'ein die` elosollllliiitwbllt l' elnilil is:

'1. lo o let-boel: mechanism `fol" loolrle` lmviogl' :invul-p delivery menne und llgfrie* tion eoriialee operatively connected, with the nie-Luie. n 'flexible firlotion element to eooper l ly etotiolmly' meer M eolleoelell to the other end of the flexible element, and ineens to llollltlielnenibere in;

normal reliliiive po: tion 1n all poeiitlol e ol.

lbellrelj Denied .melllbelx u l i le e let-.bwk l'ileehalliem for looms 'bzwiilll' e. werp delivery `morini; amil :l frietioo l oollolfe `operatiwel? eoilgllleetefl lo ille menne, :l flexible llielion elellienlJ looool'iel'alte with elle lrietioll .elll'il'zloe :loll letal-cl.` .tbe `more nient `el llio forli delivery moelle, o lwo-` pori' illpporl'ioo menos: l" illen: ooromll-y lotiolmry when the .loool le Vermilion .llifl pe e beii'igr movable willi re` weet loy eneli olbol lo elueliell-llll`l lle'glliblex element; wlieo'lllo werp is lo be letz beek mld lfreely me willie lclgl'elllel` lo ou `:lllnol'llml position wlllle llle elell'leiil; ieelalfkjto more lille lleaillle elolllelil` :le o \\'liole'witll reellel'l; lo .will friction .zorl'aeeund means lo liolfl ille l pol-lie iii normal relativeposition while :mill perle ore being lilovetl together from obnorn liiiil lower@ ool'llml stationery pooitioll Clo liioiiilsiil norn'lgll 'Friction between lille ele zllellli eillfllriotioli surface. l l

3. lo eletboek llieehellism for looms hawL ille; al` werp delivery lllellne elllfzlee operatively `eollrlecteifl l al ilegible friction element-,to Cooperate with lll) lube 'friction ele* i `and e friction` the friction surface to retard movement of the warp delivery means, a pair Vof connected members one of which is secured to one end of the flexible member and the other of. which is secured to the other end of the flexible member, said members being. normally stationary and normally held against movement during vnormal running of the loom but movable relatively to each other to slacken the flexible element and movable together to move said element as a Whole with respect to the friction surface to an abnormal position, and means to maintain said members in normal relative position While they are being moved together from abnormal toward normal stationary position to maintain normal friction between the element Vand friction surface.

4r. In a let-back mechanism for looms having a Warp delivery7 means and a friction surface operatively connected to said `means,.a fiexible friction element to cooperate with the friction surface to retard' movement of the warp delivery means, a pair of connected members one of which is secured to one end of the flexible member and the other of which is secured toV the other end of the Vflexible member, mechanism to hold rrsaid members normally stationary against movement and achustable to vvary the relative position of the members, said members be-y ing movable relatively to each other Vindependently .of the. mechanism to an abnormal position to slacken the flexible element and movable together While in abnormal position to move said element as a" Whole with respect to the friction surface to an abnormal position, and means to maintain said members innormal relative positionavhile they are being moved together from abnormal tofard normal stationary position to maintain normal friction between the element an d friction surface. Y

5. In a let-back mechanism for looms having a warp delivery means and a frictionl surface operatively connected to the means, a flexible friction element cooperating with the friction surface to retard movement of the Warp delivery means, a pair of members connected together each being connected to one end of ther Hexible element, adjustable means carried by one of said members and engaging the other member tovary the relaj tive position of saidmembers andthe tension of thekflexible friction element, a support to hold said members normally in stationary position, said members being movable relatively to each other to an abnormal relative positionto slacken Vthe friction `element and movable together freely While in abnormal relative positionto move said element as a Whole with respect to the friction surface to abnormal position, and means to maintain said members in normal relative position while said members are being returned from abnormal to normal stationary position to maintain normal friction between the element and friction-sufface.

6. In a let-back mechanism for looms having a Warp delivery means and a substantially cylindrical friction surface operatively connected to said warp delivery means, a flexible friction element cooperating with the friction surface to retard movement of the varp delivery means, a pair of members connected together and movable concentrically With respect to the cylindrical surface, one of said members being connected to one end of the flexible friction element and the other member being connected to the other end of the element, said members being movableV relatively to each other to slacken the flexible friction element and movable together from normal stationary position about the center of the cylindrical friction surface to'move the element as a whole With respect to said friction surface, said members being returnable to normal relative position With respect to each other when spaced from vtheir normal stationary position to reestablish thel end of the flexible element, said members` being normally locked in stationary positionbut movable concentrically with respect to -the cylindrical friction surface, and meansV carried byone of said members to adjust the position of the other member, said members being movable from normal adjusted posit-ion relatively to each other to slacken the flexible member and thereafter movable about the center of the friction surface to move the flexible member as a Whole, said means holding the-members in normal relative position after said members are returned to their original relative position to tighten the flexible friction element, said members being movable toward their normal stationary position to give a reverse movement to the friction surface after being restored to normal relative position.

In, testimony whereof I have hereunto affixed my signature.

WALTER H. WAKEFIELI).

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